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(No Model.) I (L ,PAUTHONIEB.

PROGESS 0P REPAIRING INGANDESGENT ELECTRIC LAMP FILAMENTS.

N0. 363,909. Patented May 31, 1887.

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. NITED STATES PATENT OFF-103E.

CASIMIR PAUTHONIER, OF 17 RUE DANTON, LEVALLOIS-PERRET, ('SEINE) FRANCE. I

PROCESS OF REPAIRING lNCANDESCENT'ELECTRIC-LAMP FILAMENTS.

SPECIFICATION forming part of Letters Patent N 0. 363,909, dated May 31, 1887. Application filed December 22, 1886. Serial No. 222,217. (No model.)

To all whom it may concern:

Be it known that I, CASIMIR PAUTHONIER, at present-residing at 17 Rue Danton, Levallois- Perret, (Seine,) in the Republic of France, electrician, have invented a new and useful Improved Process of Repairing the Filaments of Electric Glow or Incandescence Lamps, of

which the following is a description.

This invention consists in aprocess of re pairing broken carbon filaments of glow or incandescenee eleetriclamps. It is well known that after a certain period of service such filaments are liable to break, and no means of repairing them has heretofore been devised. To reunite the broken carbon in such a way as to permit of the current passing, and render the lamp again as serviceable as before, is the object of the process of this invention.

Reference is to be had totthe accompanying drawings, wherein Figure 1 shows a glowlamp in working order. Fig. 2 shows the same lamp with the filament broken, while Fig. 3 shows the same lamp after it has been repaired, but before the bulb has been again exhausted of air and rescaled.

According to this process a hole is cut in the end of the glass bulb b containing the broken filaments c, as at a, Fig. 3, to allow of introducing into said bulb a hydrocarbon, such as retinaphtha,(G ll rctinyl, (O H re tinol, (C H &c., all the hydrocarbons, whether liquid or gaseous, being capable of eonducing to the desired result. The selection would depend upon the perfection of the tools employed,butliquid hydrocarbons are preferred. After the bulb is filled with aproduct rich in carbon, the sundercd ends of the filaments are brought together by means ofnippers,and the current is then passed through the filament, which immediately becomes welded or full, clear, and exact united together by a deposit of carbon which dinary way, which needs no description. The lamp thus repaired is again ready for service, which may exceedin duration its original period. of service, and it will give a whiter light, the carbon deposited being purer than that composing the filament. The liquid hydrocarbon also serves, to clean the bulbs of the carbonaceous deposit with which they become coated in consequence of the impurity of the carbon filament, and as during the welding operation the entire filament becomes covered with a light coating of carbon of greater purity, the bulb is no longer liable to become blackened in use. Moreover, the resistance of such lamps increases after prolonged use and a currentof greater tension is required in order that they may produce a light of the same intensity as at first. This has a very objectionable effect where a large number of these lamps are used together, the older ones being of a reddish hue, while the others, which are new and receive the same electro-motive force, give a whitelight. In other words, new lamps of one hundred volts electro-motive force require, after being a certain time in use, a current of one hundred and five volts electromotive force, and even more.

Lamps which have been repaired by this improved process are free from this objection as the deposit of carbon produced, as above mentioned, decreases their resistance, and the carbonbeing pure the lamp willlast for a very considerable time.

The invention isapplicable to filaments of -vegetable origin ,such as those of bamboo, (Edigaseous hydrocarbon, bringing vtogether the process of repairing the filaments of electric sundered ends of the filament, and then passglow or incandescence-lamps signed by me ing the current through the whole length of this 6th day of December, 1886. the filament, for the purpose of welding the CASIMIR PAUTHONIER.

5 ends by the deposit of carbon, all substantiallyitnesses:

as hereinbefore specified. Rom. M. HooPER,

The foregoing specification of my improved ALBERT MOREAU. 

